It’s pretty common for people to pack slides full of text and content, but most presentation experts recommend avoiding that.
If you have existing PowerPoint files you're thinking of rebuilding in Haiku Deck, you can simply import them into Haiku Deck Zuru, and they'll automatically be cleaned up and made into gorgeous visual presentations without any extra work on your part (thanks, Artificial Intelligence!). More info here:
http://www.haikudeck.com/zuru